<template>
    <!-- 商品分类导航 -->
    <div class="type-nav">
      <div class="container">
        <div @mouseenter="enterShow" @mouseleave="leaveShow">
          <h2 class="all">全部商品分类</h2>
          <transition name="sort">
            <div class="sort" v-show="show">
          <div class="all-sort-list2" @click="goSearch">
            <div class="item" v-for="(c1, index) in categoryList" :key="c1.categoryId" :class="{cur: currentIndex === index}">
              <h3 @mouseenter="changeIndex(index)">
                <a :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{ c1.categoryName }}</a>
              </h3>
              <div class="item-list clearfix" :style="{ display: currentIndex === index ?'block' :'none'}">
                <div class="subitem" v-for="c2 in c1.categoryChild" :key="c2.categoryId">
                  <dl class="fore">
                    <dt>
                      <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{ c2.categoryName }}</a>
                    </dt>
                    <dd>
                      <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                        <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{ c3.categoryName }}</a>
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
          </transition>          
        </div>
        <nav class="nav">
          <a href="###">服装城</a>
          <a href="###">美妆馆</a>
          <a href="###">尚品汇超市</a>
          <a href="###">全球购</a>
          <a href="###">闪购</a>
          <a href="###">团购</a>
          <a href="###">有趣</a>
          <a href="###">秒杀</a>
        </nav>        
      </div>
    </div>
</template>

<script>
import { mapState } from 'vuex'
import throttle from 'lodash/throttle'

export default {
  name: 'TypeNav',
  data() {
    return {
      currentIndex: -1,
      show: true
    }
  },
  mounted() {
    // console.log(this.$store)
    if(this.$route.path !== '/home') {
      this.show = false
    }
  },
  computed: {
    ...mapState({
      categoryList: state => state.Home.categoryList
    })
  },
  methods: {
    changeIndex: throttle(function(index) {
      this.currentIndex = index
    }, 50),
    goSearch(event) {
      let node = event.target
      let { categoryname, category1id, category2id, category3id } = node.dataset
      if(categoryname) {
        let location = { name: 'search' }
        let query = { categoryName: categoryname }
        if(category1id) {
          query.category1Id = category1id
        }else if(category2id) {
          query.category2Id = category2id
        }else {
          query.category3Id = category3id
        }
        location.query = query
        if(this.$route.params) {
          location.params = this.$route.params
          this.$router.push(location)
        }else {
          this.$router.push(location)
        }
      }
    },
    enterShow() {
      this.show = true
    },
    leaveShow() {
      this.currentIndex = -1
      if(this.$route.path !== '/home') {
        this.show = false
      }
    }
  }
}
</script>

<style  lang="less" scoped>
.type-nav {
    border-bottom: 2px solid #e1251b;
  
    .container {
      width: 1200px;
      margin: 0 auto;
      display: flex;
      position: relative;
  
      .all {
        width: 210px;
        height: 45px;
        background-color: #e1251b;
        line-height: 45px;
        text-align: center;
        color: #fff;
        font-size: 14px;
        font-weight: bold;
      }
  
      .nav {
        a {
          height: 45px;
          margin: 0 22px;
          line-height: 45px;
          font-size: 16px;
          color: #333;
        }
      }
  
      .sort {
        position: absolute;
        left: 0;
        top: 45px;
        width: 210px;
        height: 461px;
        position: absolute;
        background: #fafafa;
        z-index: 999;
  
        .all-sort-list2 {
          .item {
            h3 {
              line-height: 30px;
              font-size: 14px;
              font-weight: 400;
              overflow: hidden;
              padding: 0 20px;
              margin: 0;
  
              a {
                color: #333;
              }
            }
  
            .item-list {
              position: absolute;
              width: 734px;
              min-height: 460px;
              _height: 200px;
              background: #f7f7f7;
              left: 210px;
              border: 1px solid #ddd;
              top: 0;
              z-index: 9999 !important;
  
              .subitem {
                float: left;
                width: 650px;
                padding: 0 4px 0 8px;
  
                dl {
                  border-top: 1px solid #eee;
                  padding: 6px 0;
                  overflow: hidden;
                  zoom: 1;
  
                  &.fore {
                    border-top: 0;
                  }
  
                  dt {
                    float: left;
                    width: 54px;
                    line-height: 22px;
                    text-align: right;
                    padding: 3px 6px 0 0;
                    font-weight: 700;
                  }
  
                  dd {
                    float: left;
                    width: 415px;
                    padding: 3px 0 0;
                    overflow: hidden;
  
                    em {
                      float: left;
                      height: 14px;
                      line-height: 14px;
                      padding: 0 8px;
                      margin-top: 5px;
                      border-left: 1px solid #ccc;
                    }
                  }
                }
              }
            }
  
            &:hover {
              .item-list {
                display: block;
              }
            }
          }
          .cur {
            background-color: pink;
          }
        }
      }
      // 进入过渡动画开始状态
      .sort-enter {
        height: 0px;
      }
      // 进入过渡动画结束状态
      .sort-enter-to {
        height: 461px;
      }
      // 定义动画时间和速率
      .sort-enter-active {
        transition: all .2s linear;
      }
    }
  }
  </style>
  